Details

Autor(en) / Beteiligte

• Huang, Chengdu
• Huang, Yongchun
• Xie, Tenghui
• Yu, Wanguo
• Ai, Shuo

Titel

Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions

Ist Teil von

• Chemical engineering & technology, 2021-03, Vol.44 (3), p.441-448

Ort / Verlag

Frankfurt: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Chitosan was dispersed on bentonite for the preparation of a Cd2+ adsorbent. The adsorption process followed a Freundlich isotherm, and the experimental adsorption capacity was determined. For understanding the adsorption mechanism, the pristine and Cd‐doped adsorbents were analyzed by Fourier transform infrared and X‐ray photoelectron spectroscopy. A red shift of the band corresponding to amino groups was observed, while the Cd 3d binding energy declined. Furthermore, density functional theory calculation results indicated that Cd2+ bonded with amino and hydroxyl groups in chitosan. The zeta potential of the adsorbent was lower than that of the support bentonite, improving the electrostatic affinity for Cd2+. The synergy between electrostatic and coordination interactions contributed to the adsorption capacity. The presence of Cd2+ in water is a serious worldwide environmental issue for which Cd2+ removal via adsorption can be a solution. A very small amount of chitosan was dispersed on a porous inexpensive support via a facile dissolution‐precipitation approach to prepare a cost‐effective and environmentally friendly adsorbent. The Cd2+ adsorption capacity on the chitosan/bentonite adsorbent was very high.